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Quantitative Investigation on the Formation of Counter-Rotating Vortex Pairs from the Inclined Jet in Crossflow

  • C. Dai
  • Z. Shu
  • J. Mi
Conference paper
Part of the Lecture Notes in Mechanical Engineering book series (LNME)

Abstract

This study investigates by LES the formation and evolution of counter-rotating vortex pair (CRVP) from a streamwise-inclined 35° turbulent jet in a laminar crossflow (JICF). A new method is developed by which the JICF consists exclusively of a jet marked by artificial XH2O and crossflow by real H2O. Predictions by LES agree well with the experimental results of (Dai et al., Int J Heat Fluid Flow 58:11–18, 2016) [3]. It is shown that the flow patterns, visualized by the three-dimensional flow topologies, vary with the velocity ratio (VR) considerably. The hairpin vortices are illustrated to be actually the instantaneous forms of the time-averaged CRVP. Analysing the jet mass fraction distributions around the jet exit finds that the CRVP mainly comes from the coherent structures within the nozzle for VR = 0.5 and from the shear vortex at the jet/crossflow interface for VR = 2.0.

Keywords

Jet Crossflow CRVP XH2LES 

Notes

Acknowledgements

The authors acknowledge the support of the National Key Research and Development Program of China (No. 2016YFB0600605).

References

  1. 1.
    Bidan G, Nikitopoulos DE (2013) On steady and pulsed low-blowing-ratio transverse jets. J Fluid Mech 714:393–433CrossRefGoogle Scholar
  2. 2.
    Cambonie TAJ (2014) Transition scenario of the round jet in crossflow topology at low velocity ratios. Phys Fluids 26(8):084101.  https://doi.org/10.1063/1.4891850CrossRefGoogle Scholar
  3. 3.
    Dai C, Jia L, Zhang J, Shu Z, Mi J (2016) On the flow structure of an inclined jet in crossflow at low velocity ratios. Int J Heat Fluid Flow 58:11–18.  https://doi.org/10.1016/j.ijheatfluidflow.2015.12.001CrossRefGoogle Scholar
  4. 4.
    Dallmann U (1983) Topological structures of three-dimensional vortex flow separation. In: 16th fluid and plasmadynamics conference. Fluid dynamics and co-located conferences. American Institute of Aeronautics and Astronautics.  https://doi.org/10.2514/6.1983-1735
  5. 5.
    Li H, Ghaly W, Hassan I (2016) The formation of counter-rotating vortex pair and the nature of liftoff-reattachment in film-cooling flow. Fluids 1(4):39.  https://doi.org/10.3390/fluids1040039CrossRefGoogle Scholar
  6. 6.
    Mahesh K (2013) The interaction of jets with crossflow. Annu Rev Fluid Mech 45(1):379–407.  https://doi.org/10.1146/annurev-fluid-120710-101115MathSciNetCrossRefzbMATHGoogle Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.Department of Energy & Resource Engineering, College of EngineeringPeking UniversityBeijingPeople’s Republic of China

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